Backlight unit and display device

Abstract

Disclosed are a backlight unit and a display device. The backlight unit includes a bottom cover including first and second longer sides and first and second shorter sides, a light emitting module disposed on at least one of the first and second longer sides and the first and second shorter sides in the bottom cover, a light guide plate having at least a part disposed on the light emitting module in the bottom cover, an optical sheet on the light guide plate, a support member connected to the bottom cover and having at least a part disposed on the optical sheet, and a top cover disposed on the support member and connected to the bottom cover.

What is claimed is: 
     
       1. A backlight unit comprising:
 a bottom cover including first and second longer sides and first and second shorter sides, wherein the bottom cover includes a first convex part extended in a first direction and at least one second convex part in a second direction parallel to the shorter side; 
 a light emitting module disposed on at least one of the first and second longer sides and the first and second shorter sides in the bottom cover; 
 a light guide plate having at least a part disposed on the light emitting module in the bottom cover; 
 an optical sheet on the light guide plate; 
 a support member connected to the bottom cover and having at least a part disposed on the optical sheet; 
 a first heat radiation member is interposed between the second convex parts; and 
 a top cover disposed on the support member and connected to the bottom cover. 
 
     
     
       2. The backlight unit of  claim 1 , wherein the light emitting module includes a light emitting module substrate and a plurality of semiconductor light emitting devices disposed on the light emitting module substrate. 
     
     
       3. The backlight unit of  claim 1 , wherein the light emitting module is interposed between the bottom cover and the top cover. 
     
     
       4. The backlight unit of  claim 1 , wherein the light emitting module is disposed under the light guide plate to irradiate light toward a lower surface of the light guide plate. 
     
     
       5. The backlight unit of  claim 1 , further comprising a second heat radiation member is disposed on the first heat radiation member and the light emitting module is disposed on the second heat radiation member. 
     
     
       6. The backlight unit of  claim 5 , wherein the second heat radiation member has a protrusion part and the surface of the protrusion part is arranged in line with the top surfaces of the first convex part and the second convex part. 
     
     
       7. The backlight unit of  claim 1 , further comprising a reflective sheet between the bottom cover and the light guide plate. 
     
     
       8. The backlight unit of  claim 1 , wherein the support member includes a body extending in the first direction and branches extending in the second direction from the body. 
     
     
       9. The backlight unit of  claim 1 , wherein a reflective layer is formed on the inclined surface of the light guide plate. 
     
     
       10. A backlight unit comprising:
 a bottom cover including first and second longer sides and first and second shorter sides, wherein the bottom cover includes a first convex part extended in a first direction and at least one second convex part in a second direction parallel to the shorter side; 
 a light emitting module disposed on at least one of the first and second longer sides and the first and second shorter sides in the bottom cover and including a plurality of light sources; 
 a light guide plate having at least a part disposed on the light emitting module in the bottom cover; 
 an optical sheet on the light guide plate; 
 a support member connected to the bottom cover and making contact with a top surface of the optical sheet such that a lower surface of the optical sheet makes contact with the light guide plate; 
 a first heat radiation member is interposed between the second convex parts; and 
 a top cover disposed on the support member and connected to the bottom cover. 
 
     
     
       11. The backlight unit of  claim 10 , wherein the light emitting module includes a light emitting module substrate and a plurality of semiconductor light emitting devices disposed on the light emitting module substrate. 
     
     
       12. The backlight unit of  claim 10 , wherein the light emitting module is interposed between the bottom cover and the top cover. 
     
     
       13. The backlight unit of  claim 10 , wherein the light emitting module is disposed under the light guide plate to irradiate light toward a lower surface of the light guide plate. 
     
     
       14. The backlight unit of  claim 10 , further comprising a second heat radiation member is disposed on the first heat radiation member and the light emitting module is disposed on the second heat radiation member. 
     
     
       15. The backlight unit of  claim 14 , the second heat radiation member has a protrusion part and the surface of the protrusion part is arranged in line with the top surfaces of the first convex part and the second convex part. 
     
     
       16. The backlight unit of  claim 10 , further comprising a reflective sheet between the bottom cover and the light guide plate. 
     
     
       17. The backlight unit of  claim 10 , wherein the support member includes a body extending in the first direction and branches extending in the second direction from the body. 
     
     
       18. The backlight unit of  claim 10 , wherein a reflective layer is formed on the inclined surface of the light guide plate. 
     
     
       19. A display device comprising:
 a backlight unit, which includes a bottom cover including first and second longer sides and first and second shorter sides, wherein the bottom cover includes a first convex part extended in a first direction and at least one second convex part in a second direction parallel to the shorter side, a light emitting module disposed on at least one of the first and second longer sides and the first and second shorter sides in the bottom cover, a light guide plate having at least a part disposed on the light emitting module in the bottom cover, an optical sheet on the light guide plate, a support member connected to the bottom cover and having at least a part disposed on the optical sheet, a first heat radiation member is interposed between the second convex parts and a top cover disposed on the support member and connected to the bottom cover; and 
 a display panel supported by the support member and the top cover and disposed on the optical sheet. 
 
     
     
       20. The display device of  claim 19 , wherein a reflective layer is formed on the inclined surface of the light guide plate.